Changes to support using base/feature_list.h from gin/.

gin/shell/gin_main.cc

Index: gin/shell/gin_main.cc
diff --git a/gin/shell/gin_main.cc b/gin/shell/gin_main.cc
index 1fff9f5e5a0d0542dbade113b47780e6093c2953..b45afefe567dca4f8a620b998f0426ca6bccb993 100644
--- a/gin/shell/gin_main.cc
+++ b/gin/shell/gin_main.cc
@@ -5,6 +5,7 @@
 #include "base/at_exit.h"
 #include "base/bind.h"
 #include "base/command_line.h"
+#include "base/feature_list.h"
 #include "base/files/file_util.h"
 #include "base/i18n/icu_util.h"
 #include "base/macros.h"
@@ -68,6 +69,9 @@ int main(int argc, char** argv) {
 
   base::MessageLoop message_loop;
 
+  // Initialize the base::FeatureList since IsolateHolder can depend on it.
+  base::FeatureList::SetInstance(make_scoped_ptr(new base::FeatureList));
+
   gin::IsolateHolder::Initialize(gin::IsolateHolder::kStrictMode,
                                  gin::IsolateHolder::kStableV8Extras,
                                  gin::ArrayBufferAllocator::SharedInstance());